Horizontal brush support



FIG. 1 is a front view of a horizontal brush support showing my new design;

FIG. 2 is a top view;

FIG. 3 is a bottom view;

FIG. 4 is a side view;

FIG. 5 is the opposite side view;

FIG. 6 is a rear view; and,

FIG. 7 is a perspective front view showing my new design. 

The ornamental design for a horizontal brush support, as shown and described. 